@unpublished{repository41441,
       publisher = {universitas muhammadiyah Prof. Dr.Hamka Jakarta},
           title = {Surat Tugas Pembicara Seminar Nasional},
            note = {Unpublished},
             url = {http://repository.uhamka.ac.id/id/eprint/41441/},
          author = {indah, Indah}
}